Alex Lan focused on enhancing validation coverage in the AvaloniaUI/angle repository by developing a targeted test to reproduce a known ANGLE validation bug affecting CubeMap rendering. Using C++ and GLSL, Alex implemented the CubeMapBug2 test to isolate issues related to texture samplers and binding units, then configured the test to be skipped in continuous integration to maintain stability while the root cause is investigated. This approach improved the reliability of the CI pipeline and provided a clear path for future bug diagnosis and fix verification. The work demonstrated depth in graphics programming, shader development, and systematic testing methodology.